PC Skyrim Menu Bug

Hello
I have a problem, when I start the game, instead of the main menu the game loads up with a character in Riverwood named Prisoner. This video should explain:

The game just jumps from the main menu to the ingame world without me doing anything, also it loads up a save I don't even have. I really don't know what is happening, I would appreciate any help.
P.S. I have reinstalled the game twice already and verified the files. The game has no mods.